Using Avaya IPO as sip trunk with Lync – problems dialling international and cellphone numbers
June 22, 2012
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After connecting Avaya IPO to our Lync infrastructure we discovered that long distance calls from Lync often failed, especially to cell phones/mobiles – usually with a “cannot accept call 405”.
Thanks to this: http://trogjels.wordpress.com/2012/03/22/outbound-call-from-lync-fails-timeout-issues/
I discovered it’s due to Lync giving up on calls through the pstn after 10 seconds! change the config file referenced here so the timeout is 20 seconds and restart server (or just front end and mediation service) and your issue will be resolved.